Had to tackle the rear brakes on this. The front brakes are all new thanks to PO but the rear is unknown and I was hearing a slight grinding sound in the back.
Tried to remove them one night for inspection. First thing I noticed is that 2 of the studs on each corner still had the factory locking clips which leads me to believe that these drums have never been off since 1978 and these are the original brake shoes and also tells me this K5 has 79k original miles. Another sign is the brake pedal pad is not worn on the right like they usually are at higher miles. Normally those clips are not re-installed after a brake job and its my understanding that the main purpose of those clips are for the assembly line so the rotors do not fall off when going through down the line. Its almost impossible to not destroy or distort the round locking clips when removing them and these clips look like they have never been touched.
After getting the clips off and destroying them, I soon realized the drums were not coming off that easy. Those MF's would not come off even when I pulled out the BFH and I was going at it hard enough that I was either going to mess up the bearings or distort the drums. Also to note- I may have lost some hearing that night...
Plan B- I finally ordered the correct drum puller which looks like this:

Picture above is not mine but taken from this video:
The puller got them both off quickly even though the drums had a ridge on the back and the tool pulled it across the shoes with no issue. I was pretty impressed with the tool making quick work for removing. After getting the drivers side off, I soon found where the sound was coming from. Worn down to the rivets which caused some deep grooves in the drums and are not salvageable. On top of that, it looks like a spiders nest inside:

What the Helly?
Other side wasn't so bad and the drum was in much better shape. No grooves and just starting to touch the rivets.
Ended up getting all new stuff at NAPA since they had everything in stock and was close by. Also they do online coupons now which helps with $$$. Got new shoes, all hardware and 2 new drums. I would have had the drums turned if they were both in better shape but with the one being so bad, it was worth it to me to just buy new and have matching drums plus my time was limited that day. As you know, turning drums requires more down time since you have to drop them off and they usually take up to 4 hours if they can do them that day then go pick them up. NAPA stocks the brake hardware in 3 different part numbers which I would suggest. Both of my bottom spreaders were seized up and I didn't feel like trying to clean and restore those. I also noted I have 2.75" wide brakes which NAPA did carry. Part Part #: FLT FT473. When I searched other parts stores , they only carry the 2" wide brake pads so good thing to keep in mind and always measure your shoes width and double check. The cheaper ones are bonded and the more expensive are HD and riveted. I got the bonded. Part numbers for pads and brake hardware below:
- Important Information: w/ 11 5/32" X 2 3/4" Brakes

I always forget how much FUN drum brakes are to do. I did find a decent video which is great reference for me since I rarely replace drum brakes these days. I ALWAYS forget which spring goes where so it helps having some reference and having colored springs. I did not replace the wheel cylinders since they were not leaking (yet) but now is the best time to do that for peace of mind. Something I would consider if I had to do it again.
Helpful video guide here: